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Merge pull request #11827 from keszybz/pkgconfig-variables
[thirdparty/systemd.git] / src / network / networkd-dhcp4.c
CommitLineData
53e1b683 1/* SPDX-License-Identifier: LGPL-2.1+ */
3c9b8860
TG		 2
3#include <netinet/ether.h>
4#include <linux/if.h>
5
b5efdb8a 6#include "alloc-util.h"
958b66ea 7#include "hostname-util.h"
64b21ece 8#include "parse-util.h"
3c9b8860 9#include "network-internal.h"
23f53b99
TG		 10#include "networkd-link.h"
11#include "networkd-manager.h"
12#include "networkd-network.h"
64b21ece
MV		 13#include "string-util.h"
14#include "sysctl-util.h"
3c9b8860 15
302a796f 16static int dhcp4_route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3c9b8860
TG		 17 int r;
18
19 assert(link);
6cf4a01c 20 assert(link->dhcp4_messages > 0);
3c9b8860 21
313cefa1 22 link->dhcp4_messages--;
3c9b8860 23
1c4baffc 24 r = sd_netlink_message_get_errno(m);
3c9b8860 25 if (r < 0 && r != -EEXIST) {
f6b8196f 26 log_link_error_errno(link, r, "Could not set DHCPv4 route: %m");
3c9b8860
TG		 27 link_enter_failed(link);
28 }
29
6cf4a01c 30 if (link->dhcp4_messages == 0) {
3c9b8860 31 link->dhcp4_configured = true;
8012cd39 32 link_check_ready(link);
3c9b8860
TG		 33 }
34
35 return 1;
36}
37
d6eac9bd
DW		 38static int route_scope_from_address(const Route *route, const struct in_addr *self_addr) {
39 assert(route);
40 assert(self_addr);
41
42 if (in_addr_is_localhost(AF_INET, &route->dst) ||
43 (self_addr->s_addr && route->dst.in.s_addr == self_addr->s_addr))
44 return RT_SCOPE_HOST;
45 else if (in4_addr_is_null(&route->gw.in))
46 return RT_SCOPE_LINK;
47 else
48 return RT_SCOPE_UNIVERSE;
49}
50
3c9b8860 51static int link_set_dhcp_routes(Link *link) {
f8693fc7 52 _cleanup_free_ sd_dhcp_route **static_routes = NULL;
8cdc46e7 53 bool classless_route = false, static_route = false;
f8862395
TH		 54 const struct in_addr *router;
55 struct in_addr address;
3c9b8860 56 int r, n, i;
fc1ba79d 57 uint32_t table;
3c9b8860
TG		 58
59 assert(link);
0c9b15a3
AJ		 60
61 if (!link->dhcp_lease) /* link went down while we configured the IP addresses? */
62 return 0;
63
64 if (!link->network) /* link went down while we configured the IP addresses? */
65 return 0;
964b26fe
SS		 66
67 if (!link->network->dhcp_use_routes)
68 return 0;
3c9b8860 69
bdb9f580 70 table = link_get_dhcp_route_table(link);
fc1ba79d 71
b23aec0d
DW		 72 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
73 if (r < 0)
74 return log_link_warning_errno(link, r, "DHCP error: could not get address: %m");
75
5f04a209 76 n = sd_dhcp_lease_get_routes(link->dhcp_lease, &static_routes);
599c44e6
YW		 77 if (n == -ENODATA)
78 log_link_debug_errno(link, n, "DHCP: No routes received from DHCP server: %m");
79 else if (n < 0)
8dc787d1 80 log_link_debug_errno(link, n, "DHCP error: could not get routes: %m");
5f04a209 81
8cdc46e7 82 for (i = 0; i < n; i++) {
3476951c
TH		 83 switch (sd_dhcp_route_get_option(static_routes[i])) {
84 case SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE:
8cdc46e7 85 classless_route = true;
3476951c
TH		 86 break;
87 case SD_DHCP_OPTION_STATIC_ROUTE:
8cdc46e7 88 static_route = true;
3476951c
TH		 89 break;
90 }
8cdc46e7
SS		 91 }
92
5f04a209 93 for (i = 0; i < n; i++) {
8e766630 94 _cleanup_(route_freep) Route *route = NULL;
5f04a209 95
8cdc46e7
SS		 96 /* if the DHCP server returns both a Classless Static Routes option and a Static Routes option,
97 the DHCP client MUST ignore the Static Routes option. */
3476951c
TH		 98 if (classless_route &&
99 sd_dhcp_route_get_option(static_routes[i]) != SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE)
8cdc46e7
SS		 100 continue;
101
5f04a209
SS		 102 r = route_new(&route);
103 if (r < 0)
104 return log_link_error_errno(link, r, "Could not allocate route: %m");
105
106 route->family = AF_INET;
107 route->protocol = RTPROT_DHCP;
108 assert_se(sd_dhcp_route_get_gateway(static_routes[i], &route->gw.in) >= 0);
109 assert_se(sd_dhcp_route_get_destination(static_routes[i], &route->dst.in) >= 0);
110 assert_se(sd_dhcp_route_get_destination_prefix_length(static_routes[i], &route->dst_prefixlen) >= 0);
111 route->priority = link->network->dhcp_route_metric;
112 route->table = table;
113 route->scope = route_scope_from_address(route, &address);
114
115 r = route_configure(route, link, dhcp4_route_handler);
116 if (r < 0)
117 return log_link_warning_errno(link, r, "Could not set host route: %m");
118
119 link->dhcp4_messages++;
120 }
121
f8862395 122 r = sd_dhcp_lease_get_router(link->dhcp_lease, &router);
825ace96
YW		 123 if (IN_SET(r, 0, -ENODATA))
124 log_link_info(link, "DHCP: No gateway received from DHCP server.");
125 else if (r < 0)
444b0170 126 log_link_warning_errno(link, r, "DHCP error: could not get gateway: %m");
825ace96
YW		 127 else if (in4_addr_is_null(&router[0]))
128 log_link_info(link, "DHCP: Received gateway is null.");
f6b8196f 129
5f04a209
SS		 130 /* According to RFC 3442: If the DHCP server returns both a Classless Static Routes option and
131 a Router option, the DHCP client MUST ignore the Router option. */
8cdc46e7
SS		 132 if (classless_route && static_route)
133 log_link_warning(link, "Classless static routes received from DHCP server: ignoring static-route option and router option");
134
f8862395 135 if (r > 0 && !classless_route && !in4_addr_is_null(&router[0])) {
860e636c 136 _cleanup_(route_freep) Route *route = NULL, *route_gw = NULL;
ed9e361a
TG		 137
138 r = route_new(&route_gw);
f6b8196f
LP		 139 if (r < 0)
140 return log_link_error_errno(link, r, "Could not allocate route: %m");
3c9b8860
TG		 141
142 /* The dhcp netmask may mask out the gateway. Add an explicit
143 * route for the gw host so that we can route no matter the
144 * netmask or existing kernel route tables. */
145 route_gw->family = AF_INET;
f8862395 146 route_gw->dst.in = router[0];
3c9b8860 147 route_gw->dst_prefixlen = 32;
2ce40956 148 route_gw->prefsrc.in = address;
3c9b8860 149 route_gw->scope = RT_SCOPE_LINK;
ed9e361a 150 route_gw->protocol = RTPROT_DHCP;
86655331 151 route_gw->priority = link->network->dhcp_route_metric;
fc1ba79d 152 route_gw->table = table;
3c9b8860 153
483d099e 154 r = route_configure(route_gw, link, dhcp4_route_handler);
f6b8196f
LP		 155 if (r < 0)
156 return log_link_warning_errno(link, r, "Could not set host route: %m");
3c9b8860 157
313cefa1 158 link->dhcp4_messages++;
3c9b8860 159
860e636c
YW		 160 r = route_new(&route);
161 if (r < 0)
162 return log_link_error_errno(link, r, "Could not allocate route: %m");
163
3c9b8860 164 route->family = AF_INET;
f8862395 165 route->gw.in = router[0];
2ce40956 166 route->prefsrc.in = address;
860e636c 167 route->protocol = RTPROT_DHCP;
86655331 168 route->priority = link->network->dhcp_route_metric;
fc1ba79d 169 route->table = table;
3c9b8860 170
483d099e 171 r = route_configure(route, link, dhcp4_route_handler);
3c9b8860 172 if (r < 0) {
f6b8196f 173 log_link_warning_errno(link, r, "Could not set routes: %m");
3c9b8860
TG		 174 link_enter_failed(link);
175 return r;
176 }
177
313cefa1 178 link->dhcp4_messages++;
3c9b8860
TG		 179 }
180
3c9b8860
TG		 181 return 0;
182}
183
184static int dhcp_lease_lost(Link *link) {
8e766630 185 _cleanup_(address_freep) Address *address = NULL;
f8862395 186 const struct in_addr *router;
3c9b8860
TG		 187 struct in_addr addr;
188 struct in_addr netmask;
f414a269 189 unsigned prefixlen = 0;
3c9b8860
TG		 190 int r;
191
192 assert(link);
193 assert(link->dhcp_lease);
194
79008bdd 195 log_link_warning(link, "DHCP lease lost");
3c9b8860 196
27cb34f5 197 if (link->network->dhcp_use_routes) {
f8693fc7 198 _cleanup_free_ sd_dhcp_route **routes = NULL;
3c9b8860
TG		 199 int n, i;
200
201 n = sd_dhcp_lease_get_routes(link->dhcp_lease, &routes);
202 if (n >= 0) {
203 for (i = 0; i < n; i++) {
8e766630 204 _cleanup_(route_freep) Route *route = NULL;
3c9b8860 205
ed9e361a 206 r = route_new(&route);
3c9b8860
TG		 207 if (r >= 0) {
208 route->family = AF_INET;
f8693fc7
BG		 209 assert_se(sd_dhcp_route_get_gateway(routes[i], &route->gw.in) >= 0);
210 assert_se(sd_dhcp_route_get_destination(routes[i], &route->dst.in) >= 0);
211 assert_se(sd_dhcp_route_get_destination_prefix_length(routes[i], &route->dst_prefixlen) >= 0);
3c9b8860 212
4645ad47 213 route_remove(route, link, NULL);
3c9b8860
TG		 214 }
215 }
216 }
217 }
218
f0213e37 219 r = address_new(&address);
3c9b8860 220 if (r >= 0) {
f8862395
TH		 221 r = sd_dhcp_lease_get_router(link->dhcp_lease, &router);
222 if (r > 0 && !in4_addr_is_null(&router[0])) {
8e766630
LP		 223 _cleanup_(route_freep) Route *route_gw = NULL;
224 _cleanup_(route_freep) Route *route = NULL;
3c9b8860 225
ed9e361a 226 r = route_new(&route_gw);
3c9b8860
TG		 227 if (r >= 0) {
228 route_gw->family = AF_INET;
f8862395 229 route_gw->dst.in = router[0];
3c9b8860
TG		 230 route_gw->dst_prefixlen = 32;
231 route_gw->scope = RT_SCOPE_LINK;
232
4645ad47 233 route_remove(route_gw, link, NULL);
3c9b8860
TG		 234 }
235
ed9e361a 236 r = route_new(&route);
3c9b8860
TG		 237 if (r >= 0) {
238 route->family = AF_INET;
f8862395 239 route->gw.in = router[0];
3c9b8860 240
4645ad47 241 route_remove(route, link, NULL);
3c9b8860
TG		 242 }
243 }
244
f414a269
TG		 245 r = sd_dhcp_lease_get_address(link->dhcp_lease, &addr);
246 if (r >= 0) {
247 r = sd_dhcp_lease_get_netmask(link->dhcp_lease, &netmask);
248 if (r >= 0)
5a941f5f 249 prefixlen = in4_addr_netmask_to_prefixlen(&netmask);
3c9b8860 250
f414a269
TG		 251 address->family = AF_INET;
252 address->in_addr.in = addr;
253 address->prefixlen = prefixlen;
3c9b8860 254
63ae0569 255 address_remove(address, link, NULL);
f414a269 256 }
3c9b8860
TG		 257 }
258
27cb34f5 259 if (link->network->dhcp_use_mtu) {
3c9b8860
TG		 260 uint16_t mtu;
261
262 r = sd_dhcp_lease_get_mtu(link->dhcp_lease, &mtu);
263 if (r >= 0 && link->original_mtu != mtu) {
264 r = link_set_mtu(link, link->original_mtu);
265 if (r < 0) {
79008bdd 266 log_link_warning(link,
3c9b8860
TG		 267 "DHCP error: could not reset MTU");
268 link_enter_failed(link);
269 return r;
270 }
271 }
272 }
273
27cb34f5 274 if (link->network->dhcp_use_hostname) {
3c9b8860
TG		 275 const char *hostname = NULL;
276
27cb34f5
LP		 277 if (link->network->dhcp_hostname)
278 hostname = link->network->dhcp_hostname;
dce391e7
LP		 279 else
280 (void) sd_dhcp_lease_get_hostname(link->dhcp_lease, &hostname);
a7d0ef44 281
dce391e7
LP		 282 if (hostname) {
283 /* If a hostname was set due to the lease, then unset it now. */
59eb33e0 284 r = manager_set_hostname(link->manager, NULL);
3c9b8860 285 if (r < 0)
dce391e7 286 log_link_warning_errno(link, r, "Failed to reset transient hostname: %m");
3c9b8860
TG		 287 }
288 }
289
290 link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
6a3e5f6a 291 link_dirty(link);
3c9b8860
TG		 292 link->dhcp4_configured = false;
293
294 return 0;
295}
296
302a796f 297static int dhcp4_address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3c9b8860
TG		 298 int r;
299
300 assert(link);
301
1c4baffc 302 r = sd_netlink_message_get_errno(m);
3c9b8860 303 if (r < 0 && r != -EEXIST) {
f6b8196f 304 log_link_error_errno(link, r, "Could not set DHCPv4 address: %m");
3c9b8860 305 link_enter_failed(link);
45af44d4 306 } else if (r >= 0)
200a0868 307 manager_rtnl_process_address(rtnl, m, link->manager);
3c9b8860
TG		 308
309 link_set_dhcp_routes(link);
310
223932c7
AH		 311 if (link->dhcp4_messages == 0) {
312 link->dhcp4_configured = true;
313 link_check_ready(link);
314 }
315
3c9b8860
TG		 316 return 1;
317}
318
319static int dhcp4_update_address(Link *link,
320 struct in_addr *address,
321 struct in_addr *netmask,
322 uint32_t lifetime) {
8e766630 323 _cleanup_(address_freep) Address *addr = NULL;
3c9b8860
TG		 324 unsigned prefixlen;
325 int r;
326
327 assert(address);
328 assert(netmask);
329 assert(lifetime);
330
5a941f5f 331 prefixlen = in4_addr_netmask_to_prefixlen(netmask);
3c9b8860 332
f0213e37 333 r = address_new(&addr);
3c9b8860
TG		 334 if (r < 0)
335 return r;
336
337 addr->family = AF_INET;
338 addr->in_addr.in.s_addr = address->s_addr;
339 addr->cinfo.ifa_prefered = lifetime;
340 addr->cinfo.ifa_valid = lifetime;
341 addr->prefixlen = prefixlen;
342 addr->broadcast.s_addr = address->s_addr | ~netmask->s_addr;
343
66669078
TG		 344 /* allow reusing an existing address and simply update its lifetime
345 * in case it already exists */
483d099e 346 r = address_configure(addr, link, dhcp4_address_handler, true);
3c9b8860
TG		 347 if (r < 0)
348 return r;
349
350 return 0;
351}
352
353static int dhcp_lease_renew(sd_dhcp_client *client, Link *link) {
354 sd_dhcp_lease *lease;
355 struct in_addr address;
356 struct in_addr netmask;
357 uint32_t lifetime = CACHE_INFO_INFINITY_LIFE_TIME;
358 int r;
359
360 assert(link);
361 assert(client);
362 assert(link->network);
363
364 r = sd_dhcp_client_get_lease(client, &lease);
f6b8196f
LP		 365 if (r < 0)
366 return log_link_warning_errno(link, r, "DHCP error: no lease: %m");
3c9b8860
TG		 367
368 sd_dhcp_lease_unref(link->dhcp_lease);
369 link->dhcp4_configured = false;
e6b18ffa 370 link->dhcp_lease = sd_dhcp_lease_ref(lease);
6a3e5f6a 371 link_dirty(link);
3c9b8860
TG		 372
373 r = sd_dhcp_lease_get_address(lease, &address);
f6b8196f
LP		 374 if (r < 0)
375 return log_link_warning_errno(link, r, "DHCP error: no address: %m");
3c9b8860
TG		 376
377 r = sd_dhcp_lease_get_netmask(lease, &netmask);
f6b8196f
LP		 378 if (r < 0)
379 return log_link_warning_errno(link, r, "DHCP error: no netmask: %m");
3c9b8860
TG		 380
381 if (!link->network->dhcp_critical) {
f6b8196f
LP		 382 r = sd_dhcp_lease_get_lifetime(link->dhcp_lease, &lifetime);
383 if (r < 0)
384 return log_link_warning_errno(link, r, "DHCP error: no lifetime: %m");
3c9b8860
TG		 385 }
386
387 r = dhcp4_update_address(link, &address, &netmask, lifetime);
388 if (r < 0) {
f6b8196f 389 log_link_warning_errno(link, r, "Could not update IP address: %m");
3c9b8860
TG		 390 link_enter_failed(link);
391 return r;
392 }
393
394 return 0;
395}
396
397static int dhcp_lease_acquired(sd_dhcp_client *client, Link *link) {
f8862395 398 const struct in_addr *router;
3c9b8860
TG		 399 sd_dhcp_lease *lease;
400 struct in_addr address;
401 struct in_addr netmask;
3c9b8860
TG		 402 unsigned prefixlen;
403 uint32_t lifetime = CACHE_INFO_INFINITY_LIFE_TIME;
404 int r;
405
406 assert(client);
407 assert(link);
408
409 r = sd_dhcp_client_get_lease(client, &lease);
f2341e0a 410 if (r < 0)
f6b8196f 411 return log_link_error_errno(link, r, "DHCP error: No lease: %m");
3c9b8860
TG		 412
413 r = sd_dhcp_lease_get_address(lease, &address);
f2341e0a 414 if (r < 0)
f6b8196f 415 return log_link_error_errno(link, r, "DHCP error: No address: %m");
3c9b8860
TG		 416
417 r = sd_dhcp_lease_get_netmask(lease, &netmask);
f2341e0a 418 if (r < 0)
f6b8196f 419 return log_link_error_errno(link, r, "DHCP error: No netmask: %m");
3c9b8860 420
5a941f5f 421 prefixlen = in4_addr_netmask_to_prefixlen(&netmask);
3c9b8860 422
f8862395 423 r = sd_dhcp_lease_get_router(lease, &router);
397d15fd 424 if (r < 0 && r != -ENODATA)
f6b8196f 425 return log_link_error_errno(link, r, "DHCP error: Could not get gateway: %m");
3c9b8860 426
f8862395 427 if (r > 0 && !in4_addr_is_null(&router[0]))
f2341e0a
LP		 428 log_struct(LOG_INFO,
429 LOG_LINK_INTERFACE(link),
430 LOG_LINK_MESSAGE(link, "DHCPv4 address %u.%u.%u.%u/%u via %u.%u.%u.%u",
431 ADDRESS_FMT_VAL(address),
432 prefixlen,
f8862395 433 ADDRESS_FMT_VAL(router[0])),
f2341e0a
LP		 434 "ADDRESS=%u.%u.%u.%u", ADDRESS_FMT_VAL(address),
435 "PREFIXLEN=%u", prefixlen,
f8862395 436 "GATEWAY=%u.%u.%u.%u", ADDRESS_FMT_VAL(router[0]));
3c9b8860 437 else
f2341e0a
LP		 438 log_struct(LOG_INFO,
439 LOG_LINK_INTERFACE(link),
440 LOG_LINK_MESSAGE(link, "DHCPv4 address %u.%u.%u.%u/%u",
441 ADDRESS_FMT_VAL(address),
442 prefixlen),
443 "ADDRESS=%u.%u.%u.%u", ADDRESS_FMT_VAL(address),
a1230ff9 444 "PREFIXLEN=%u", prefixlen);
3c9b8860 445
e6b18ffa 446 link->dhcp_lease = sd_dhcp_lease_ref(lease);
6a3e5f6a 447 link_dirty(link);
3c9b8860 448
27cb34f5 449 if (link->network->dhcp_use_mtu) {
3c9b8860
TG		 450 uint16_t mtu;
451
452 r = sd_dhcp_lease_get_mtu(lease, &mtu);
453 if (r >= 0) {
454 r = link_set_mtu(link, mtu);
455 if (r < 0)
f2341e0a 456 log_link_error_errno(link, r, "Failed to set MTU to %" PRIu16 ": %m", mtu);
3c9b8860
TG		 457 }
458 }
459
27cb34f5 460 if (link->network->dhcp_use_hostname) {
2de2abad
LB		 461 const char *dhcpname = NULL;
462 _cleanup_free_ char *hostname = NULL;
3c9b8860 463
27cb34f5 464 if (link->network->dhcp_hostname)
2de2abad 465 dhcpname = link->network->dhcp_hostname;
dce391e7 466 else
2de2abad
LB		 467 (void) sd_dhcp_lease_get_hostname(lease, &dhcpname);
468
469 if (dhcpname) {
470 r = shorten_overlong(dhcpname, &hostname);
471 if (r < 0)
472 log_link_warning_errno(link, r, "Unable to shorten overlong DHCP hostname '%s', ignoring: %m", dhcpname);
473 if (r == 1)
474 log_link_notice(link, "Overlong DCHP hostname received, shortened from '%s' to '%s'", dhcpname, hostname);
475 }
a7d0ef44 476
dce391e7 477 if (hostname) {
59eb33e0 478 r = manager_set_hostname(link->manager, hostname);
3c9b8860 479 if (r < 0)
f2341e0a 480 log_link_error_errno(link, r, "Failed to set transient hostname to '%s': %m", hostname);
3c9b8860
TG		 481 }
482 }
483
27cb34f5 484 if (link->network->dhcp_use_timezone) {
21b80ad1
LP		 485 const char *tz = NULL;
486
487 (void) sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
488
489 if (tz) {
59eb33e0 490 r = manager_set_timezone(link->manager, tz);
21b80ad1
LP		 491 if (r < 0)
492 log_link_error_errno(link, r, "Failed to set timezone to '%s': %m", tz);
493 }
494 }
495
3c9b8860 496 if (!link->network->dhcp_critical) {
f2341e0a 497 r = sd_dhcp_lease_get_lifetime(link->dhcp_lease, &lifetime);
fc95c359
YW		 498 if (r < 0)
499 return log_link_warning_errno(link, r, "DHCP error: no lifetime: %m");
3c9b8860
TG		 500 }
501
502 r = dhcp4_update_address(link, &address, &netmask, lifetime);
503 if (r < 0) {
f2341e0a 504 log_link_warning_errno(link, r, "Could not update IP address: %m");
3c9b8860
TG		 505 link_enter_failed(link);
506 return r;
507 }
508
509 return 0;
510}
511static void dhcp4_handler(sd_dhcp_client *client, int event, void *userdata) {
512 Link *link = userdata;
513 int r = 0;
514
515 assert(link);
516 assert(link->network);
517 assert(link->manager);
518
519 if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
520 return;
521
522 switch (event) {
03748142
DH		 523 case SD_DHCP_CLIENT_EVENT_EXPIRED:
524 case SD_DHCP_CLIENT_EVENT_STOP:
525 case SD_DHCP_CLIENT_EVENT_IP_CHANGE:
3c9b8860 526 if (link->network->dhcp_critical) {
f6b8196f 527 log_link_error(link, "DHCPv4 connection considered system critical, ignoring request to reconfigure it.");
3c9b8860
TG		 528 return;
529 }
530
531 if (link->dhcp_lease) {
532 r = dhcp_lease_lost(link);
533 if (r < 0) {
534 link_enter_failed(link);
535 return;
536 }
537 }
538
03748142 539 if (event == SD_DHCP_CLIENT_EVENT_IP_CHANGE) {
3c9b8860
TG		 540 r = dhcp_lease_acquired(client, link);
541 if (r < 0) {
542 link_enter_failed(link);
543 return;
544 }
545 }
546
547 break;
03748142 548 case SD_DHCP_CLIENT_EVENT_RENEW:
3c9b8860
TG		 549 r = dhcp_lease_renew(client, link);
550 if (r < 0) {
551 link_enter_failed(link);
552 return;
553 }
554 break;
03748142 555 case SD_DHCP_CLIENT_EVENT_IP_ACQUIRE:
3c9b8860
TG		 556 r = dhcp_lease_acquired(client, link);
557 if (r < 0) {
558 link_enter_failed(link);
559 return;
560 }
561 break;
562 default:
563 if (event < 0)
f6b8196f 564 log_link_warning_errno(link, event, "DHCP error: Client failed: %m");
3c9b8860 565 else
f6b8196f 566 log_link_warning(link, "DHCP unknown event: %i", event);
3c9b8860
TG		 567 break;
568 }
569
570 return;
571}
572
7192bb81
LP		 573static int dhcp4_set_hostname(Link *link) {
574 _cleanup_free_ char *hostname = NULL;
575 const char *hn;
576 int r;
577
578 assert(link);
579
580 if (!link->network->dhcp_send_hostname)
581 hn = NULL;
582 else if (link->network->dhcp_hostname)
583 hn = link->network->dhcp_hostname;
584 else {
585 r = gethostname_strict(&hostname);
586 if (r < 0 && r != -ENXIO) /* ENXIO: no hostname set or hostname is "localhost" */
587 return r;
588
589 hn = hostname;
590 }
591
a8494759
YW		 592 r = sd_dhcp_client_set_hostname(link->dhcp_client, hn);
593 if (r == -EINVAL && hostname)
594 /* Ignore error when the machine's hostname is not suitable to send in DHCP packet. */
595 log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to set hostname from kernel hostname, ignoring: %m");
596 else if (r < 0)
597 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set hostname: %m");
598
599 return 0;
7192bb81
LP		 600}
601
64b21ece 602static bool promote_secondaries_enabled(const char *ifname) {
3f550c31
HV		 603 _cleanup_free_ char *promote_secondaries_sysctl = NULL;
604 char *promote_secondaries_path;
64b21ece
MV		 605 int r;
606
607 promote_secondaries_path = strjoina("net/ipv4/conf/", ifname, "/promote_secondaries");
608 r = sysctl_read(promote_secondaries_path, &promote_secondaries_sysctl);
609 if (r < 0) {
610 log_debug_errno(r, "Cannot read sysctl %s", promote_secondaries_path);
611 return false;
612 }
613
614 truncate_nl(promote_secondaries_sysctl);
615 r = parse_boolean(promote_secondaries_sysctl);
616 if (r < 0)
617 log_warning_errno(r, "Cannot parse sysctl %s with content %s as boolean", promote_secondaries_path, promote_secondaries_sysctl);
618 return r > 0;
619}
620
621/* dhcp4_set_promote_secondaries will ensure this interface has
622 * the "promote_secondaries" option in the kernel set. If this sysctl
623 * is not set DHCP will work only as long as the IP address does not
624 * changes between leases. The kernel will remove all secondary IP
625 * addresses of an interface otherwise. The way systemd-network works
626 * is that the new IP of a lease is added as a secondary IP and when
627 * the primary one expires it relies on the kernel to promote the
628 * secondary IP. See also https://github.com/systemd/systemd/issues/7163
629 */
630int dhcp4_set_promote_secondaries(Link *link) {
631 int r;
632
633 assert(link);
634 assert(link->network);
635 assert(link->network->dhcp & ADDRESS_FAMILY_IPV4);
636
637 /* check if the kernel has promote_secondaries enabled for our
638 * interface. If it is not globally enabled or enabled for the
639 * specific interface we must either enable it.
640 */
8e1a7253 641 if (!(promote_secondaries_enabled("all") || promote_secondaries_enabled(link->ifname))) {
64b21ece
MV		 642 char *promote_secondaries_path = NULL;
643
644 log_link_debug(link, "promote_secondaries is unset, setting it");
645 promote_secondaries_path = strjoina("net/ipv4/conf/", link->ifname, "/promote_secondaries");
646 r = sysctl_write(promote_secondaries_path, "1");
647 if (r < 0)
648 log_link_warning_errno(link, r, "cannot set sysctl %s to 1", promote_secondaries_path);
649 return r > 0;
650 }
651
652 return 0;
653}
654
fff1f40c
YW		 655int dhcp4_set_client_identifier(Link *link) {
656 int r;
657
658 assert(link);
659 assert(link->network);
660 assert(link->dhcp_client);
661
662 switch (link->network->dhcp_client_identifier) {
663 case DHCP_CLIENT_ID_DUID: {
0cf7c3fd 664 /* If configured, apply user specified DUID and IAID */
fff1f40c
YW		 665 const DUID *duid = link_get_duid(link);
666
0cf7c3fd
YW		 667 if (duid->type == DUID_TYPE_LLT && duid->raw_data_len == 0)
668 r = sd_dhcp_client_set_iaid_duid_llt(link->dhcp_client,
8217ed5e 669 link->network->iaid_set,
0cf7c3fd
YW		 670 link->network->iaid,
671 duid->llt_time);
672 else
673 r = sd_dhcp_client_set_iaid_duid(link->dhcp_client,
8217ed5e 674 link->network->iaid_set,
0cf7c3fd
YW		 675 link->network->iaid,
676 duid->type,
677 duid->raw_data_len > 0 ? duid->raw_data : NULL,
678 duid->raw_data_len);
fff1f40c 679 if (r < 0)
0cf7c3fd 680 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set IAID+DUID: %m");
fff1f40c
YW		 681 break;
682 }
683 case DHCP_CLIENT_ID_DUID_ONLY: {
684 /* If configured, apply user specified DUID */
685 const DUID *duid = link_get_duid(link);
686
0cf7c3fd
YW		 687 if (duid->type == DUID_TYPE_LLT && duid->raw_data_len == 0)
688 r = sd_dhcp_client_set_duid_llt(link->dhcp_client,
89b3fa66 689 duid->llt_time);
0cf7c3fd
YW		 690 else
691 r = sd_dhcp_client_set_duid(link->dhcp_client,
692 duid->type,
693 duid->raw_data_len > 0 ? duid->raw_data : NULL,
694 duid->raw_data_len);
fff1f40c
YW		 695 if (r < 0)
696 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set DUID: %m");
697 break;
698 }
699 case DHCP_CLIENT_ID_MAC:
700 r = sd_dhcp_client_set_client_id(link->dhcp_client,
701 ARPHRD_ETHER,
702 (const uint8_t *) &link->mac,
703 sizeof(link->mac));
704 if (r < 0)
705 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set client ID: %m");
706 break;
707 default:
708 assert_not_reached("Unknown client identifier type.");
709 }
710
711 return 0;
712}
713
3c9b8860
TG		 714int dhcp4_configure(Link *link) {
715 int r;
716
717 assert(link);
718 assert(link->network);
e0ee46f2 719 assert(link->network->dhcp & ADDRESS_FAMILY_IPV4);
3c9b8860 720
0bc70f1d 721 if (!link->dhcp_client) {
db3d2358 722 r = sd_dhcp_client_new(&link->dhcp_client, link->network->dhcp_anonymize);
1f6860d9
YW		 723 if (r == -ENOMEM)
724 return log_oom();
0bc70f1d 725 if (r < 0)
1f6860d9 726 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to create DHCP4 client: %m");
0bc70f1d 727 }
3c9b8860
TG		 728
729 r = sd_dhcp_client_attach_event(link->dhcp_client, NULL, 0);
730 if (r < 0)
1f6860d9 731 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to attach event: %m");
3c9b8860 732
76253e73
DW		 733 r = sd_dhcp_client_set_mac(link->dhcp_client,
734 (const uint8_t *) &link->mac,
735 sizeof (link->mac), ARPHRD_ETHER);
3c9b8860 736 if (r < 0)
1f6860d9 737 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set MAC address: %m");
3c9b8860 738
2f8e7633 739 r = sd_dhcp_client_set_ifindex(link->dhcp_client, link->ifindex);
3c9b8860 740 if (r < 0)
1f6860d9 741 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set ifindex: %m");
3c9b8860
TG		 742
743 r = sd_dhcp_client_set_callback(link->dhcp_client, dhcp4_handler, link);
744 if (r < 0)
1f6860d9 745 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set callback: %m");
3c9b8860
TG		 746
747 r = sd_dhcp_client_set_request_broadcast(link->dhcp_client,
748 link->network->dhcp_broadcast);
749 if (r < 0)
1f6860d9 750 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for broadcast: %m");
3c9b8860
TG		 751
752 if (link->mtu) {
753 r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu);
754 if (r < 0)
1f6860d9 755 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set MTU: %m");
3c9b8860
TG		 756 }
757
27cb34f5 758 if (link->network->dhcp_use_mtu) {
39745a5a 759 r = sd_dhcp_client_set_request_option(link->dhcp_client,
22805d92 760 SD_DHCP_OPTION_INTERFACE_MTU);
39745a5a 761 if (r < 0)
1f6860d9 762 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for MTU: %m");
3c9b8860
TG		 763 }
764
5e77a146 765 /* NOTE: even if this variable is called "use", it also "sends" PRL
766 * options, maybe there should be a different configuration variable
767 * to send or not route options?. */
28522b0d 768 /* NOTE: when using Anonymize=yes, routes PRL options are sent
769 * by default, so they don't need to be added here. */
5e77a146 770 if (link->network->dhcp_use_routes && !link->network->dhcp_anonymize) {
3c9b8860 771 r = sd_dhcp_client_set_request_option(link->dhcp_client,
22805d92 772 SD_DHCP_OPTION_STATIC_ROUTE);
3c9b8860 773 if (r < 0)
1f6860d9
YW		 774 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for static route: %m");
775
3c9b8860 776 r = sd_dhcp_client_set_request_option(link->dhcp_client,
22805d92 777 SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE);
7d6884b6 778 if (r < 0)
1f6860d9 779 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for classless static route: %m");
3c9b8860
TG		 780 }
781
ead36ce6 782 if (link->network->dhcp_use_ntp) {
783 r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_NTP_SERVER);
784 if (r < 0)
1f6860d9 785 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for NTP server: %m");
ead36ce6 786 }
4b7b5abb 787
89573b37 788 if (link->network->dhcp_use_timezone) {
789 r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_NEW_TZDB_TIMEZONE);
790 if (r < 0)
1f6860d9 791 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for timezone: %m");
89573b37 792 }
8eb9058d 793
7192bb81
LP		 794 r = dhcp4_set_hostname(link);
795 if (r < 0)
a8494759 796 return r;
3c9b8860
TG		 797
798 if (link->network->dhcp_vendor_class_identifier) {
799 r = sd_dhcp_client_set_vendor_class_identifier(link->dhcp_client,
800 link->network->dhcp_vendor_class_identifier);
801 if (r < 0)
1f6860d9 802 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set vendor class identifier: %m");
3c9b8860
TG		 803 }
804
af1c0de0
SS		 805 if (link->network->dhcp_user_class) {
806 r = sd_dhcp_client_set_user_class(link->dhcp_client, (const char **) link->network->dhcp_user_class);
807 if (r < 0)
1f6860d9 808 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set user class: %m");
af1c0de0
SS		 809 }
810
9faed222
SS		 811 if (link->network->dhcp_client_port) {
812 r = sd_dhcp_client_set_client_port(link->dhcp_client, link->network->dhcp_client_port);
813 if (r < 0)
1f6860d9 814 return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set listen port: %m");
9faed222
SS		 815 }
816
fff1f40c 817 return dhcp4_set_client_identifier(link);
3c9b8860 818}
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